Microsoft details how to move Excel Power Pivot models into Power BI
Microsoft has published a formal migration path for moving existing Excel Power Pivot models directly into Power BI Desktop. The process transfers your underlying data structure, including Power Query transformations and existing DAX formulas. The migration is not a complete conversion. Standard Excel tables, pivot charts, cell-based formulas, and VBA macros are left behind during the transfer. Users must rebuild their actual reports and visuals from scratch inside Power BI. Once the model is migrated, the original Excel file can still connect to the new Power BI dataset for ad hoc analysis.
Analysts tasked with turning legacy Excel reports into interactive dashboards usually face a brutal manual rebuild. You had to copy hundreds of Power Query steps line by line, rewrite complex DAX measures from scratch, and hope the numbers still matched the original spreadsheet. Now, the heaviest lifting of the transition moves automatically. However, this exposes a harsh reality because a poorly structured Excel data model runs just as slowly in Power BI. The migration saves you from retyping formulas, but it forces you to finally learn proper data modelling to make the resulting dashboard usable.
Analysis
Do not treat this as a magic button that turns your messy spreadsheets into clean dashboards. Migrating a bloated Excel file just gives you a bloated Power BI report that takes four hours to refresh. Use the migration strictly to salvage your working Power Query steps and DAX measures, then build a clean data model around them from scratch.
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